To provide a small-sized photo elasticity modulator which can be easily set to a photo elasticity measuring device and to provide the photo elasticity measuring device including the same.
A piezoelectric element 47 is brought into contact with an end of a peripheral side surface of a disk like optical element 46 and a side opposite to the piezoelectric element 47 of the optical element is brought into contact with a frame 48 to support both ends of the optical element 46. In this construction, the resonance frequency of the photo elasticity modulator 45 is set to be a frequency lower than the resonance frequency of the optical element 46 to vibrate the optical element from the piezoelectric element 47. Since only stress due to inertia of the piezoelectric element 47 is applied to the optical element 46 after vibration applied to the optical element 46 is attenuated, an amount of birefringence is uniformly generated in the optical element 46 and, in this state, light is made to be transmitted by the optical element 46 to apply modulation to the transmitted light.
KUDO SHIGEKI
ITO TORU
MURATA HIROYUKI
KANAZAWA MASAHIRO
TORAY ENG CO LTD